You can use global spamBlocker settings to optimize your spamBlocker configuration. Because some of these parameters affect the amount of memory that spamBlocker uses on your Firebox or XTM device, you must balance spamBlocker performance with other device functions.
Before you can configure global spamBlocker settings, you must enable spamBlocker for at least one proxy policy.
To configure the global parameters for spamBlocker:
Usually, 20–40K is enough for spamBlocker to correctly detect spam. However, if image-based spam is a problem for your organization, you can increase the maximum file size to block more image-based spam.
For information about the default and maximum scan limits for each XTM device model, see About spamBlocker Scan Limits.
A local cache can improve performance because it reduces network traffic. Usually, you do not have to change this value.
You can set the Cache size to 0 to force all email to be sent to CYREN. This is most often used only for troubleshooting.
This feature uses a large amount of memory while the local database is updated. If you have limited memory or processor resources, you might want to disable this feature. For more information, see About spamBlocker Proactive Patterns.